I have a 93 240 with about 76K on it. Today after driving for a few hours, I parked the car. A few minutes later I had to move it and could not get the shifter out of park without a great deal of difficulty; I thought I was going to break it. Once out of park it shifted normally, and the transmission shifts normally with minimal noise while driving. I checked the ATF and it may be a bit low; it was difficult to read the dipstick. Any ideas?